Should one button do 2 actions (GitHub Case Study)?

Case in point – GitHub’s "Fork" button. This button used to show all the forks that exist for the current repository but now it doesn’t do that anymore. GitHub suddenly changed it to act as if the "user wants to create a new…
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What is a better way to present sign up / login form?

It has become quite common and dare I say annoying these days to see websites and mobile apps prominently highlighting the ‘sign up’ for new user fields but at the same time why do they make ‘Login’ for existing users so hard to find?
I un…